BogTrapsA field guide to growing carnivorous plants

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Carnivorous plant troubleshooter: symptoms and likely causes

Most problems with carnivorous plants trace back to light, water, soil, feeding or the season. Choose the symptom you see and work through the likely causes, each with a quick check drawn from the International Carnivorous Plant Society's guides [1, 4].

Published October 15, 2026Awaiting editor reviewRuns in your browser; nothing you enter is sent anywhere.

Every symptom and its likely causes

The same checklist without the selector. Each cause links to the page that explains it, with sources.

Venus flytrap traps or leaves turning black Venus flytrap
  1. Old leaves dying off normally. Are only the older, outer leaves blackening while new leaves keep coming from the centre? A healthy plant keeps growing new leaves; the ICPS guide notes that 1 cm of pure sand on the surface makes older leaves less likely to rot completely.[1]Problem guide
  2. A trap that has finished or failed a meal. Did the blackened trap recently close on food? Feed live insects or rehydrated dried bloodworms, and massage dead food so the trap closes fully and digests it.[1]Problem guideCare guide
  3. Salty water or worn-out soil. Is your water above about 90 ppm TDS, or has the plant been in the same soil for more than a year? Salty soil makes new traps fail to develop.[1]Problem guideCare guide
  4. Normal winter die-back outdoors. Is it autumn or winter and is the plant outdoors? Dormant flytraps keep only small, low leaves for months.[1]Problem guideCare guide
  5. Rot at the base. Is the plant sitting in soggy mix with the water level close to the surface? The ICPS guide keeps the water level more than 5 cm below the soil surface.[1]Problem guideCare guide
Venus flytrap traps not closing, or closing slowly Venus flytrap
  1. Too little light. Is the plant on a windowsill without supplemental light? Flytraps need more light than a typical windowsill provides.[1]Problem guideCare guide
  2. An underfed or exhausted plant. Has it gone months without catching or being fed? Plants that are not fed decline.[1]Problem guideCare guide
  3. Dormancy or a cold spell. Is it late autumn or winter outdoors? Growth slows as plants go dormant.[1]Problem guideCare guide
Venus flytrap sending up a tall flower stalk Venus flytrap
  1. Normal spring flowering. Is it spring? In spring, as flower stalks emerge, plants also tend to make upright leaves with long, narrow petioles.[1]Problem guide
Pale, floppy or stretched leaves with little red colour Flytraps, sundews, pitcher plants
  1. Not enough light. Compare your light with the ICPS figures: intense-light plants want about 15,000 to 25,000 lux for 12 to 16 hours a day; office lighting is about 1,000 lux.[2]Problem guideCare guide
  2. A cultivar that never colours. Some flytrap cultivars, such as Justina Davis, make no red pigment even in strong light.[1]Problem guide
Sundew leaves without dew Sundews (Drosera)
  1. Low light. Most sundews need intense light; D. adelae and D. prolifera prefer moderate light.[2]Problem guideCare guide
  2. Mineral-rich water. Check the TDS of your water against the ICPS limits.[1]Problem guideCare guide
  3. A temperate sundew going dormant. Cold temperate sundews and D. binata die back for winter; the plant may be forming a winter bud.[3]Problem guideCare guide
Sarracenia pitchers turning brown North American pitcher plants
  1. Pitchers reaching the end of their life. Are the browning pitchers the older ones while new growth looks healthy? Remove only the brown parts; green tissue feeds the rhizome.[4]Problem guide
  2. Heat and dry air. In very hot, dry weather pitchers can burn; some afternoon shade helps.[4]Problem guideCare guide
  3. The pot dried out. Sarracenia must never dry out; pots should stand in about 4 to 6 cm of water.[4]Problem guideCare guide
  4. Rhizome rot. Is the rhizome soft or the growth point dead? Fertilizing adult plants, salty water and some fungi cause rhizome rot.[5]Problem guide
Nepenthes making leaves but no pitchers Tropical pitcher plants
  1. Light too low. Nepenthes want moderate light, about 8,000 to 15,000 lux of white light.[2]Problem guideCare guide
  2. A plant that does not suit house conditions. Species and hybrids with thick, waxy leaves make the best house plants, given a window with some direct sun.[6]Problem guideCare guide
White crust on the soil or burnt leaf tips All carnivorous plants
  1. Dissolved minerals building up. Measure your water. Ordinary filters do not remove dissolved salts; use distilled, reverse osmosis or clean rain water if TDS is too high.[1]Problem guideCare guide
  2. Fertilizer in the soil. Was the plant fertilized, or potted in a mix with added fertilizer or lime? Use plain sphagnum peat with no additives.[7]Problem guideCare guide
Plant collapsing or rotting at the base in wet soil All carnivorous plants
  1. Root or rhizome rot. Are the base or rhizome soft and dark? Fertilizer in contact with dead plant parts and salty water encourage rhizome rot in Sarracenia.[5]Problem guide
  2. A pot that stays soggy. Match pot height and mix to the water level; flytraps must be wet but not soggy.[1]Problem guideCare guide
Tiny flies around the pot All carnivorous plants
  1. Fungus gnats. The adults are a nuisance, but the larvae eat roots and leaves touching the soil.[8]Problem guide
Insects, sticky residue or white fluff on leaves All carnivorous plants
  1. Aphids. Look at new growth and flower buds; lacewing eggs nearby are a sign aphids are around.[9]Problem guide
  2. Mealybugs. Look for white, cottony insects in leaf bases. Quarantine and inspect new plants; there is no sure-fire cure.[10]Problem guide
Grey, fuzzy mold on dying leaves in winter Flytraps and pitcher plants in winter storage
  1. Dead leaves in still, cool air. Old leaves kept out of the weather can harbour pests and reduce air circulation, inviting fungus; trim the dead parts.[4]Problem guide

How to use it

Start with the symptom closest to what you see, then work through its causes one at a time. Each check is a question you can answer by looking at the plant, the pot or your growing conditions, and each cause links to a problem page that explains it in more detail with its own sources.

Several symptoms share causes. Water with too many dissolved minerals shows up as burnt leaf tips, blackening flytrap traps and sundews without dew; the ICPS guide notes that soil that has become too salty also stops new flytrap traps from developing properly [1]. Too little light shows up as pale, stretched growth and slow traps [2]. If more than one symptom fits, check the shared causes first.

Normal changes that look like problems

Some of the things growers worry about are normal. Flytrap leaves age and die back while new ones grow from the centre, and outdoor plants spend months of the year small and low while dormant [1]. Sarracenia pitchers brown off with age, and the ICPS guide advises cutting off only the brown part because the plant recovers nutrients from older leaves [4]. In spring, flytraps that are about to flower often put out upright leaves with long, narrow petioles [1].

When the checklist does not fit

Pests and diseases are the other common cause. Fungus gnat larvae damage roots and leaves touching the soil [8]; mealybugs are best kept out by quarantining and checking new plants [10]; and Sarracenia rhizome rot follows fertilizing adult plants, salty water, or certain fungi [5]. If nothing here matches, compare your conditions with the water, light and soil guides, since most problems start with one of those three.

Related guides

Other tools

Sources

  1. Growing Dionaea muscipula. International Carnivorous Plant Society. TDS under 90 ppm; dormancy only for plants facing freezing weather outdoors; LED wattage and lux; USDA-zone advice; soil choices. Accessed October 12, 2026.
  2. LED Plant Lighting. International Carnivorous Plant Society. Light requirement by genus; lux, lumens and watts per square foot; 12 to 16 hours a day. Accessed October 12, 2026.
  3. Growing cold temperate Drosera. International Carnivorous Plant Society. Hibernacula and a definite winter; 50:50 peat:sand. Accessed October 12, 2026.
  4. Growing Sarracenia. International Carnivorous Plant Society. Hardiness by USDA zone; winter storage; 1:1 peat:sand mix; perlite outdoors; S. psittacina in pure peat. Accessed October 12, 2026.
  5. Sarracenia Rhizome Rot. International Carnivorous Plant Society. Plants killed by salty water (TDS 350, pH 8) combined with drying out. Accessed October 12, 2026.
  6. Growing Nepenthes. International Carnivorous Plant Society. Habitats and the plants that suit beginners. Accessed October 12, 2026.
  7. Peat, Sand, Perlite. International Carnivorous Plant Society. Equal peat and coarse sand as the default mix; sand grain 1.5 to 2 mm; perlite caveats. Accessed October 12, 2026.
  8. Fungus Gnat Larvae. International Carnivorous Plant Society. Larvae damage roots and leaves touching the soil. Accessed October 12, 2026.
  9. Pests & Other Issues. International Carnivorous Plant Society. Mealybugs, fungus gnat larvae, Sarracenia rhizome rot. Accessed October 12, 2026.
  10. Mealybugs. International Carnivorous Plant Society. Quarantine and inspection of new plants. Accessed October 12, 2026.